AP432AQL-7

PMIC - Voltage Reference: AP432AQL-7 application field and working principle

The AP432AQL-7 is a low voltage voltage regulator device developed by Diodes Incorporated, operating from a single 2.5V to 6V supply. Suitable for low power (<150 mA) and fast switching applications, it can provide precise control of low voltage variable outputs from 0.3V to 5.5V. It is widely used in many fields, such as smart phones, laptops and embedded systems.

Introduction

The AP 432AQL-7 is a low drop out (LDO) linear voltage regulator that uses MOSFET switch to achieve fast transient response. It is capable of providing high current outputs while accurately controlling the output voltage. With a low quiescent current and high accuracy, the AP432AQL-7 offers good performance to cost ratio for battery-operated, cost-sensitive applications.

The AP432AQL-7 is based on CMOS architecture, making it suitable for applications that require low power consumption. It features an adjustable top-off output voltage range of 0.3V to 5.5V, can deliver up to 150mA continuous load current, as well as provides transient protection from input surge currents.

The AP432AQL-7 features integrated over current protection, thermal shutdown protection, and overvoltage protection, which helps ensure reliable operation in all conditions. The device also features an enable/disable pin, allowing it to be controlled externally. This device is a single IC solution that combines high power density, low power consumption and good transient response.

Applications

• Smart phones
• Tablets
• Protection circuits
• Portable instruments
• Communication systems
• Embedded systems

Working Principle

The AP432AQL-7 operates by using a MOSFET switch. In general, a linear voltage regulator creates a stable DC output voltage from an input voltage. The regulator is essentially an amplifier with negative feedback to maintain a fixed output voltage. The voltage regulator uses a feedback loop to compare the actual output voltage with a reference voltage. The feedback loop then adjusts the input voltage depending on the comparison.

The AP432AQL-7 utilizes a PMOS FET as the main power switch and an error amplifier, or op amp, as the control element, with a positive feedback loop to ensure stability. The error amplifier senses any voltage deviation from the reference voltage and adjusts the gate voltage of the power switch accordingly. As the output voltage rises, the error amplifier reduces the gate voltage, which in turn decreases the amount of current to the output, and vice versa.

The AP432AQL-7 also features an enable/disable pin, allowing the user to turn the regulator off with very low quiescent current. The integrated overvoltage protection and over current protection circuitry ensure reliable operation even in extreme environment and harsh conditions.

Conclusion

The AP432AQL-7 is a low voltage, low power linear voltage regulator device developed by Diodes Incorporated, operating from a single 2.5V to 6V supply. It is suitable for applications such as smart phones, laptops, protection circuits, and embedded systems. With a low dropout voltage, fast transient response, and excellent accuracy, the AP432AQL-7 is an ideal solution for low power and cost sensitive applications.